Giving Away A Book A Day

We have a winner from yesterday: Joe successfully guessed Joe Biden's bid for the 1988 Democratic nomination, which was derailed by accusations of plagiarism before the first caucus or primary. Congratulations! I'll be in touch about getting you your prize.

As for Sunday's contest, 975 guesses and still no winner. So let me give two hints.

Hint #1: The number is between 1 and 1,503.

Hint #2: The number has something to do with the new issue of mental_floss magazine.